Whenever u feel unhappy chant
Hare Krishana Hare Krishana Krishana Krishana Hare Hare
Hare Rama Hare Rama Rama Rama Hare Hare
and find out whats the reason behind this sadness. Always find materialistic illusion. Like whenever one whom u love most ( as your friend,,relatives, partner) breakup the bond with u and give anxiety which give u sadness. Rather than u feel unhappiness, u should feel its Krishana wishes, and accepting the Lord's supermercy wholeheartedly.
Never Let anything which distract u